Battery charging system for motor-generator
First Claim
1. A battery charging system for motor-generator mounted on an electric vehicle, said vehicle having a battery, a motor provided to drive an axle of said vehicle depending on the electric energy supplied from said battery, a generator connected to said battery, an engine provided to drive said generator for charging said battery, engine speed changing means for variably changing an engine speed, generator speed detecting means for detecting a generator speed and for generating a generator speed signal indicative thereof and battery terminal voltage sensing means for sensing a battery terminal voltage and for generating a battery terminal voltage signal indicative thereof, said system comprising:
- charge setting means responsive to said battery terminal voltage signal for discriminating a condition where the battery should be charged;
engine driving means for driving said engine only while said condition is discriminated by said charge setting means;
target generator speed setting means for setting a target speed of said generator while said charge setting means discriminates said condition and for generating a target speed signal indicative thereof; and
engine speed control means responsive to said generator speed signal and said target speed signal for actuating said engine speed changing means to control the engine speed in the manner that said generator speed converges to said target speed.
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Accused Products
Abstract
A battery charging system for a motor-generator, having a generator for charging a battery, and an engine for driving the generator, comprises a generator speed sensor for detecting a generator speed of the generator; and an engine speed control circuit for controlling an engine speed of the engine in the manner that the generator speed is set to a predetermined speed. The system can improve a charged efficiency and a long-life battery by charging the battery to control a speed of the generator so as to perform a feedback control of the engine without keeping the engine speed at a constant speed, and by adaptively controlling the battery by detecting gases occurring in the battery, namely, a gassing.
72 Citations
17 Claims
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1. A battery charging system for motor-generator mounted on an electric vehicle, said vehicle having a battery, a motor provided to drive an axle of said vehicle depending on the electric energy supplied from said battery, a generator connected to said battery, an engine provided to drive said generator for charging said battery, engine speed changing means for variably changing an engine speed, generator speed detecting means for detecting a generator speed and for generating a generator speed signal indicative thereof and battery terminal voltage sensing means for sensing a battery terminal voltage and for generating a battery terminal voltage signal indicative thereof, said system comprising:
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charge setting means responsive to said battery terminal voltage signal for discriminating a condition where the battery should be charged; engine driving means for driving said engine only while said condition is discriminated by said charge setting means; target generator speed setting means for setting a target speed of said generator while said charge setting means discriminates said condition and for generating a target speed signal indicative thereof; and engine speed control means responsive to said generator speed signal and said target speed signal for actuating said engine speed changing means to control the engine speed in the manner that said generator speed converges to said target speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A battery charging system for motor-generator mounted on an electric vehicle, said vehicle having a battery, a motor provided to drive an axle of said vehicle depending on the electric energy supplied from said battery, a generator connected to said battery, an engine provided to drive said generator for charging said battery, engine speed changing means for variably changing an engine speed, generator speed detecting means for detecting a generator speed and for generating a generator speed signal indicative thereof, battery terminal voltage sensing means for sensing a battery terminal voltage and for generating a battery terminal voltage signal indicative thereof and current sensing means for sensing a current flowing from said battery to said generator and for generating a current signal indicative thereof, said system comprising:
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charge setting means responsive to said battery terminal voltage signal and said current signal for discriminating a condition where the battery should be charged; engine driving means for driving said engine only while said condition is discriminated by said charge setting means; target generator speed setting means for setting a target speed of said generator while said charge setting means discriminates said condition and for generating a target speed signal indicative thereof; and engine speed control means responsive to said generator speed signal and said target speed signal for actuating said engine speed changing means to control the engine speed in the manner that said generator speed converges to said target speed. - View Dependent Claims (15, 16, 17)
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Specification